/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.typeutils;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.typeinfo.AtomicType;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.IntComparator;
import org.apache.flink.api.common.typeutils.base.IntSerializer;
import org.apache.flink.api.common.typeutils.base.LongComparator;
import org.apache.flink.api.common.typeutils.base.LongSerializer;
import org.apache.flink.table.api.DataTypes;

import java.lang.reflect.Constructor;
import java.util.Objects;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Type information for SQL INTERVAL types.
 *
 * @deprecated This class will be removed in future versions as it is used for the old type system. It
 *             is recommended to use {@link DataTypes} instead. Please make sure to use either the old
 *             or the new type system consistently to avoid unintended behavior. See the website documentation
 *             for more information.
 */
@Internal
@Deprecated
public final class TimeIntervalTypeInfo<T> extends TypeInformation<T> implements AtomicType<T> {

	private static final long serialVersionUID = -1816179424364825258L;

	public static final TimeIntervalTypeInfo<Integer> INTERVAL_MONTHS = new TimeIntervalTypeInfo<>(
		Integer.class,
		IntSerializer.INSTANCE,
		IntComparator.class);

	public static final TimeIntervalTypeInfo<Long> INTERVAL_MILLIS = new TimeIntervalTypeInfo<>(
		Long.class,
		LongSerializer.INSTANCE,
		LongComparator.class);

	private final Class<T> clazz;
	private final TypeSerializer<T> serializer;
	private final Class<? extends TypeComparator<T>> comparatorClass;

	private TimeIntervalTypeInfo(
		Class<T> clazz,
		TypeSerializer<T> serializer,
		Class<? extends TypeComparator<T>> comparatorClass) {
		this.clazz = checkNotNull(clazz);
		this.serializer = checkNotNull(serializer);
		this.comparatorClass = checkNotNull(comparatorClass);
	}

	@Override
	public boolean isBasicType() {
		return false;
	}

	@Override
	public boolean isTupleType() {
		return false;
	}

	@Override
	public int getArity() {
		return 1;
	}

	@Override
	public int getTotalFields() {
		return 1;
	}

	@Override
	public Class<T> getTypeClass() {
		return clazz;
	}

	@Override
	public boolean isKeyType() {
		return true;
	}

	@Override
	public TypeSerializer<T> createSerializer(ExecutionConfig config) {
		return serializer;
	}

	@Override
	public TypeComparator<T> createComparator(
		boolean sortOrderAscending,
		ExecutionConfig executionConfig) {
		try {
			Constructor<? extends TypeComparator<T>> constructor = comparatorClass.getConstructor(Boolean.TYPE);
			return constructor.newInstance(sortOrderAscending);
		} catch (Exception e) {
			throw new RuntimeException(
				"Could not initialize comparator " + comparatorClass.getName(), e);
		}
	}

	// ----------------------------------------------------------------------------------------------

	@Override
	public int hashCode() {
		return Objects.hash(clazz, serializer, comparatorClass);
	}

	@Override
	public boolean canEqual(Object obj) {
		return obj instanceof TimeIntervalTypeInfo;
	}

	@Override
	public boolean equals(Object obj) {

		if (obj instanceof TimeIntervalTypeInfo) {
			TimeIntervalTypeInfo other = (TimeIntervalTypeInfo) obj;
			return other.canEqual(this) &&
				this.clazz.equals(other.clazz) &&
					serializer == other.serializer &&
					this.comparatorClass.equals(other.comparatorClass);
		} else {
			return false;
		}
	}

	@Override
	public String toString() {
		return TimeIntervalTypeInfo.class.getSimpleName() + "(" + clazz.getSimpleName() + ")";
	}
}
